GOS Type 4 is implementation

- startCount, endCount, idDelta, idRangeOffset and glyphIdArray arrays in format 4 generated and checked
- parsing code for cmap format 4 is added
- checking code for 4 arrays added
- regenerated Noto-Sans-KR-Thin base font
All of them will not be used. Last segment of format 4 is special and it is not used
startCount = 0xFFFF, endCount = 0xFFFF, idDelta = 1 and idRangeOffset = 0